The President has the duty to enforce all Federal Laws. The Justice department , t FBI, and all the federal regulatory agencies are under his direction . He also can call up the national guard for law enforcement duties if needed. Federal agents have the power to make arrests , pursue court actions, and levy civil fines and other sanctions against offenders of federal regulations.
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Presidents don't have legislative power. Congress has legislative powers. Presidents don't make laws.
To execute/enforce the laws that the president makes. The judicial branch reads the laws and makes sure that the laws are correct and secure. You're welcome! And P.S just remember EXECUTE!!!!! And EXECUTIVE ease Peasy lemon squeazy! 
Execute laws (A+)
Because they EXecute the laws
Making laws